Ukungu ukionekana karibu na mto, tutatembea polepole.

Ukionekana comes from the verb kuonekana, which means to be seen, to become visible, or to appear.

In this sentence, ukionekana means something like if/when it appears or if/when it becomes visible.

It can be broken down like this:

• u- = subject agreement for ukungu
• -ki- = if/when
• -onekana = be visible / appear

So ukungu ukionekana is literally fog if/when it appears.

That u- matches the noun ukungu.

Swahili verbs usually agree with the subject noun class, not just with person like in English. Since ukungu belongs to a noun class that uses u- for agreement here, the verb also takes u-.

So:

• ukungu = fog
• u-kionekana = if/when it appears

That u- is basically the it referring back to ukungu.

In this sentence, -ki- marks a conditional or time relationship. It often means:

• if
• when
• sometimes whenever, depending on context

So ukionekana can be understood as:

• if it appears
• when it appears

In many real Swahili sentences, the line between if and when is softer than in English, and context helps decide the best translation.

Because kuona means to see, while kuonekana means to be seen / to appear / to become visible.

Compare:

• kuona = to see
• kuonekana = to be seen, appear

Fog is not doing the seeing. Instead, the fog is becoming visible or appearing. That is why kuonekana is the natural choice here.

Tutatembea breaks down like this:

• tu- = we
• -ta- = future tense
• -tembea = walk

So tutatembea means we will walk.

This is a very common Swahili pattern:

• nitasoma = I will read
• utakuja = you will come
• tutatembea = we will walk

Polepole means slowly.

It looks repeated because it comes from reduplication, which is very common in Swahili. In many words, repeating a form creates an adverbial or descriptive meaning.

So polepole is just the normal word for slowly. It is not two separate words here.

You will also hear it a lot in everyday speech, for example:

• Nenda polepole = Go slowly
• Ongea polepole = Speak slowly

Karibu na means near.

So:

• karibu na mto = near the river

The word na is required here. You normally say karibu na + noun.

Examples:

• karibu na nyumba = near the house
• karibu na shule = near the school
• karibu na mto = near the river

So you should learn karibu na as a set expression meaning near.

Swahili does not usually use articles like English the and a/an.

So ukungu can mean:

• fog
• the fog

And mto can mean:

• a river
• the river

The exact meaning depends on context. English has to choose a or the, but Swahili usually leaves that unstated unless something else makes it clear.

It can be understood either way, depending on context.

Because of -ki-, the clause can express:

• a condition: if fog appears
• a time situation: when fog appears

If the speaker is talking about a possible situation, English may prefer if.
If the speaker is talking about something expected or typical, English may prefer when.

So this form is flexible, and that is normal.

That is the normal order here: noun first, then the verb that agrees with it.

So:

• ukungu ukionekana = fog appearing / if fog appears

Swahili often uses a straightforward subject + verb order, just like English in many cases. The subject noun ukungu comes first, and the verb phrase that describes it follows.

Yes, in ordinary writing you may sometimes see similar Swahili sentences with or without a comma. The comma is mainly there to separate the conditional opening clause from the main clause.

So the comma helps readability:

• Ukungu ukionekana karibu na mto, tutatembea polepole.

It marks the pause between:

• the condition or setting: Ukungu ukionekana karibu na mto
• the main result: tutatembea polepole

Mto means river, and its plural is mito. It belongs to the noun class with singular m- and plural mi-.

In this sentence, that does not affect the main verb, because mto is inside the phrase karibu na mto and is not the main subject.

The main subject is ukungu, so the important agreement here is with ukungu, not mto.

Yes, adverbs can sometimes move around a little, but tutatembea polepole is the most natural and clear order here.

This puts the adverb after the verb:

• tutatembea polepole = we will walk slowly

That is a very common pattern in Swahili, and it sounds natural.